but also comprehensive tax reform, the elimination of an entire class of nuclear weapons. reagan and his first term had spoken about the evil empire. one thing led to another. there had been no discernible progress. i do not think many people on january 20, 1981 would have anticipated ronald reagan's greatest historical accomplishment would be significant arms control. not just slowing the rate of increase in nuclear arms, but actually doing away with the whole class in what became known as the inf treaty. host: a speech in june of 1987 in berlin. [video clip] >> we welcome change and openness. we believe that freedom and security go together. the advance of human liberty, the advance of human liberty can only strengthen the cause of world peace. there is one sign that the soviets can make that would beunmistakable, that would advance dramatically the cause of freedom and peace. general secretary gorbachev, if you seek peace, if you seek prosperity for the soviet union and eastern europe, come to this gate. mr. gorbachev, open this gate. mr. gorbachev, tear down this wall.